The study was carried out to construct a valid and reliable test in Economics for secondary school students. Two research questions were drawn to guide the establishment of validity and reliability for the Economics Achievement Test (EAT). It is a multiple choice objective test of five options with 100 items. A sample of 1000 students was randomly drawn to determine the validity and reliability of the test. After item analysis, the result showed that the Economics achievement test has a high face and content validity. The test item validity was determined through Difficulty and discrimination indices. A difficult index or p-value of 0.5 for each item was considered after applying the formula of correction for guessing. The discrimination index was established through point biserial statistics for each item with a correction coefficient of at least 0.3. The test has a reliability coefficient of 0.95 established through the use of Kuder-Richardson formula 20. The test is valid and reliable for assessing students internally and prepare them for external examinations.